\part{part}
part text
part text
\chapter{chapter long title}
 chapter text
 chapter text
 \[
	 f(x)=x^2
 \]
 \section[for the toc]{section}
  section text
  section text
 \section[for the toc]{section}
  section text
  section text
  \subsection[for the toc]{subsection}
  subsection text
  subsection text
  \subsection[for the toc]{subsection}
  subsection text
  subsection text
 \section[for the toc]{section}
  section text
  section text
\chapter{chapter}
 chapter text
 chapter text
 \part{part}
 part text
 part text
\chapter[toc]{chapter title}
 chapter text
 chapter text
 \section[for the toc]{section}
  section text
  section text
  \subsubsection[for the toc]{subsubsection}
  subsubsection text
  subsubsection text
  \paragraph{paragraph}
  paragraph text
  paragraph text
  \subparagraph{subparagraph}
  subparagraph text
  subparagraph text
 \section[for the toc]{section}
  section text
  section text
  \subsubsection[for the toc]{subsubsection}
  subsubsection text
  subsubsection text
  \paragraph{paragraph}
  paragraph text
  paragraph text
  \subparagraph{subparagraph}
  subparagraph text
  subparagraph text
\chapter[somethingelse]{goes here}
